Method and system for improving accuracy of position correction data in differential global positioning system using vehicle to vehicle communication

Abstract

A method and system for improving accuracy of a position correction data in a differential global positioning system (DGPS) using vehicle to vehicle (V2V) communication, capable of correcting a DGPS data received from a road side unit (RSU) into information calculated by a sensor, and providing neighbouring vehicles with the corrected value as the DGPS data using the V2V communication, are provided.

What is claimed is: 
     
         1 . A system for improving accuracy of a position correction data in a differential global positioning system (DGPS) through vehicle to vehicle (V2V) communication, comprising:
 a global positioning system (GPS) reception unit configured to receive a GPS data from a satellite;   a V2V communication unit configured to transmit and receive a DGPS correction data, while communicating with a road side unit (RSU) or other vehicles within a communication coverage;   a sensor configured to detect a distance between the vehicle and another neighboring vehicle within the communication coverage;   a multi-hop data processing unit configured to retransmit the DGPS correction data received from the RSU or the other vehicles within the communication coverage as multi-hop information, through the V2V communication unit, according to a control data; and   
       a control unit configured to compare and calculate information output from the GPS reception unit, the V2V communication unit, and the sensor installed in the vehicle to calculate a correction position of the vehicle and correction accuracy, compare the calculated correction accuracy to a predetermined reference value, and control the multi-hop data processing unit based on a compared result to retransmit the DGPS correction data. 
     
     
         2 . The system according to  claim 1 , wherein when the calculated correction accuracy is less than the predetermined reference value, the control unit controls the multi-hop data processing unit to retransmit the DGPS correction data through the V2V communication unit. 
     
     
         3 . The system according to  claim 1 , further comprising a DGPS error adjustment unit configured to improve an error for the DGPS correction data received from the RSU or the vehicles within the communication coverage based on information for the correction position of the vehicle calculated by the control unit and to output the improved DGPS correction data,
 wherein the control unit controls the DGPS correction data improved by the DGPS error adjustment unit to be output through the V2V communication unit when the calculated correction accuracy is less than the predetermined reference value.   
     
     
         4 . The system according to  claim 1 , wherein the sensor includes any one selected from the group consisting of a laser sensor, radar, and an image sensor. 
     
     
         5 . The system according to  claim 1 , wherein the control unit checks whether or not a multi-hop count of the received DGPS correction data is greater than a predetermined value when the calculated correction accuracy is less than the predetermined reference value, and controls the DGPS correction data to be retransmitted when the multi-hop count is greater than the predetermined value. 
     
     
         6 . The system according to  claim 1 , wherein the control unit checks whether or not a multi-hop count of the received DGPS correction data is less than a predetermined value when the calculated correction accuracy is less than the predetermined reference value, and controls the DGPS correction data to be re-received through the V2V communication unit when the multi-hop count is less than the predetermined value. 
     
     
         7 . A method for improving accuracy of a position correction data using a vehicle to vehicle (V2V) communication, comprising:
 receiving, by a reception unit in a vehicle, global positioning system (GPS) information;   receiving, by the reception unit in a vehicle, a differential global positioning system (DGPS) correction data transmitted from a road side unit (RSU);   performing, by a control unit, correction for the GPS information based on the received DGPS correction data;   receiving information for a distance to another neighboring vehicle within a communication coverage area and a relative position from a sensor embodied within the vehicle;   calculating, by the control unit, a correction position of the vehicle and accuracy of the DGPS correction data based on the information obtained from the performing correction for the GPS information and the receiving the information of the distance and the relative position;   comparing, by the control unit, the accuracy calculated from the calculating the correction position and the accuracy of the correction data to a predetermined reference value; and   retransmitting, by the control unit, the DGPS correction data depending on a result compared from the comparing the accuracy.   
     
     
         8 . The method according to  claim 7 , wherein the calculating the accuracy of the position data includes checking accuracy of the DGPS correction data received from the RSU based on the information for the distance to the neighbouring other vehicle and the relative position measured by the sensor. 
     
     
         9 . The method according to  claim 7 , wherein the retransmitting the DGPS correction data includes retransmitting the DGPS correction data only when it is determined that the calculated accuracy of the DGPS correction data is greater than the predetermined reference value. 
     
     
         10 . The method according to  claim 7 , further comprising performing an error adjustment for the DGPS correction data based on the information received from the sensor,
 wherein the re-transmitting the DGPS correction data includes performing transmission for the DGPS correction data by substituting DGPS correction data adjusted in the performing the error adjustment for the DGPS correction data transmitted in the retransmitting the DGPS correction data when the accuracy of the position calculated in the comparing the accuracy of the correction data is greater than the predetermined reference value.   
     
     
         11 . A non-transitory computer readable medium containing program instructions executed by a processor or controller within a vehicle, the computer readable medium comprising:
 program instructions that perform correction for received global positioning system (GPS) information based on received differential global positioning system (DGPS) correction data;   program instructions that calculate correction position of the vehicle and accuracy of the DGPS correction data based on the information obtained from the performing correction for the GPS information and information received related to a distance to another neighboring vehicle within a communication coverage and a relative position from a sensor embodied within the vehicle;   program instructions that compare the accuracy calculated from the calculating the correction position and the accuracy of the correction data to a predetermined reference value; and   program instructions that retransmit the DGPS correction data depending on a result compared from the comparing the accuracy.   
     
     
         12 . The non-transitory computer readable medium according to  claim 11 , wherein the program instructions that calculate the accuracy of the position data includes program instructions that check the accuracy of the DGPS correction data received from the RSU based on the information for the distance to the neighbouring other vehicle and the relative position measured by the sensor. 
     
     
         13 . The non-transitory computer readable medium according to  claim 11 , wherein the program instructions that retransmit the DGPS correction data include program instructions that retransmit the DGPS correction data only when it is determined that the calculated accuracy of the DGPS correction data is greater than the predetermined reference value. 
     
     
         14 . The non-transitory computer readable medium according to  claim 11 , further comprising program instructions that perform an error adjustment for the DGPS correction data based on the information received from the sensor,
 wherein the program instructions that retransmit the DGPS correction data includes program instructions that perform transmission for the DGPS correction data by substituting DGPS correction data adjusted in the performing the error adjustment for the DGPS correction data transmitted in the retransmitting the DGPS correction data when the accuracy of the position calculated during comparing the accuracy of the correction data is greater than the predetermined reference value.